Gael Monfils was accused of tanking during his 4-6, 5-7 defeat at the hands of Jerzy Janowicz in the first round of the Western & Southern Open in Cincinnati.
Monfils looked to be in a hurry throughout the match, especially in the second set where he was getting through his serves a lot quicker than usual, and the Frenchman even turned his back on Janowicz during a rally.
"To not give 100 percent and be so blatant about it, I think it's disrespectful," former women's world number one Tracy Austin said on the Tennis Channel.
Janowicz and Monfils held serve for the first six games of the opening set before the Pole broke the Frenchman en route to taking a 5-3 lead. The remainder of the set progressed on serve, with Janowicz seeing out the set 6-4.
The second set proved to be a closer affair, with the first 10 games going on serve, only for Janowicz to break to take a 6-5 lead. Monfils saved two match points in the 12th game of the set, but it was third time lucky for Janowicz, who completed his straight sets victory in an hour and 16 minutes.
Janowicz will either face Jared Donaldson or Nicolas Mahut in the second round. Donaldson was leading 4-1 in the decider before play was suspended due to rain.
Meanwhile, 13th seed David Goffin triumphed in his first round match against Yen-Hsun Lu of Chinese Taipei, coming out on top 5-7, 6-3, 6-4. Jack Sock, Andreas Seppi, Roberto Bautista Agut and Benoit Paire also won their respective first round matches.